byte-count

    OpenVMS usage:longword_signed
    type:         longword integer (signed)
    access:       read only
    mechanism:    by value

    Byte count of the input ASCII text string. The byte-count
    argument is a signed longword integer containing the byte count
    of the input string.

 numeric-string

    OpenVMS usage:char_string
    type:         character string
    access:       read only
    mechanism:    by reference

    ASCII text string representation of a decimal, hexadecimal, or
    octal number that LIB$CVT_xTB converts to binary representation.
    The numeric-string argument is the address of a character string
    containing this input string to be converted.

    LIB$CVT_xTB allows only an optional plus (+) or minus (-) sign
    followed by a string of decimal, hexadecimal, or octal characters
    appropriate to the routine being called.

 result

    OpenVMS usage:longword_signed
    type:         longword integer (signed)
    access:       write only
    mechanism:    by reference

    Binary representation of the input string. The result argument is
    the address of a signed longword integer containing the converted
    string.